1 /*

2 * This file is part of FFmpeg.

3 *

4 * FFmpeg is free software; you can redistribute it and/or

5 * modify it under the terms of the GNU Lesser General Public

6 * License as published by the Free Software Foundation; either

7 * version 2.1 of the License, or (at your option) any later version.

8 *

9 * FFmpeg is distributed in the hope that it will be useful,

10 * but WITHOUT ANY WARRANTY; without even the implied warranty of

11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

12 * Lesser General Public License for more details.

13 *

14 * You should have received a copy of the GNU Lesser General Public

15 * License along with FFmpeg; if not, write to the Free Software

16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

17 */

18

19 /**

20 * @file

21 * byte swapping routines

22 */

23

24 #ifndef AVUTIL_X86_BSWAP_H

25 #define AVUTIL_X86_BSWAP_H

26

27 #include <stdint.h>

28 #include "config.h"

29 #include "libavutil/attributes.h"

30

31 #define bswap_16 bswap_16

32 static av_always_inline av_const uint16_t bswap_16(uint16_t x)

33 {

34 __asm__("rorw $8, %0" : "+r"(x));

35 return x;

36 }

37

38 #define bswap_32 bswap_32

39 static av_always_inline av_const uint32_t bswap_32(uint32_t x)

40 {

41 // #if HAVE_BSWAP

42 __asm__("bswap %0" : "+r" (x));

43 // #else

44 // __asm__("rorw $8, %w0 \n\t"

45 // "rorl $16, %0 \n\t"

46 // "rorw $8, %w0"

47 // : "+r"(x));

48 // #endif

49 return x;

50 }

51

52 #if ARCH_X86_64

53 #define bswap_64 bswap_64

54 static inline uint64_t av_const bswap_64(uint64_t x)

55 {

56 __asm__("bswap %0": "=r" (x) : "0" (x));

57 return x;

58 }

59 #endif

60

61 #endif /* AVUTIL_X86_BSWAP_H */